As far as the aluminum threaded sleeve, you can buy these seperately.
So the coil overs will work.(with the smaller sleeves)(if needed)
The catalogs list 280 sway bars as bigger than 240 / early 260 sway bars.
They will bolt up but if the spring rates are high on the springs it might be to much sway bar for the 240 / 260.
If it`s a good deal, get it and install it and see how it feels.
Just try to find out what the spring rates are.
The shocks will not work, the rotors and S/S line will !
Now, if you are talking about the "strut assemblies" they will bolt up to your 240.